Lifting-pulley.



W. H. POND.

LIFTING PULLEY.

APPLICATION FILED JAN. 3, 1912.

1,055,223. Patented Mar. 4, 1913.

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COLUMBIA PLANOGIMPN CO. WASHINGTON. n. c

WILLIAM H. POND, OF PROVIDENCE, RHODE ISLAND.

LIFTING-PULLEY.

Specification of Letters Patent.

App1ication filed January 3, 1912.

Patented Mar. 4, 1913.

Serial No. 669.293.

To all whom it may concern:

Be it known that I, \VILLIAM I-I. Form, a citizen of the United States,residing at Providence, in the county of Providence and State of RhodeIsland, have invented a new and useful Improvement in Lifting-Pulleys,of which the following is a specification.

This invention relates to certain new and useful improvements in liftingpulleys, and pertains more particularly to a pulley used in connectionwith jewelers stamps.

In the drawings, Figure 1 is a side elevation of the invention, showingone of the side plates removed. Fig. 2 is a section on the line 22 ofFig. 1, and Fig. 3 is a side elevation of the invention as in use.

In jewelers stamps the weight or stamp A travels on guides B, the top ofthe weight or stamp having a rope or leather belt C attached thereto. Ahand knob D is secured to the belt and the free end of the latter has afoot stirrup E secured thereto. The stamp A is possessed of considerableweight, and if permitted to drop on the hand of the operator oftentimeseffects serious injury. To lift the weight the operator grasps knob I)by pulling down on the belt, the belt pass ing over the pulley F whichis supported overhead. In devices of this kind the continual rotation ofthe pulley gradually burns the rope or belt, causing a weakening thereof, eventually resulting in a break, causing the weight to drop on thehand of the operator.

The present invention has for its objects the provision of a devicewhich will prevent burning, or wearing, or weakening, of the belt withthe result above noted.

The device consists of two side plates 1 and 2 that are rigidly keyed toa continuously rotated shaft 3, whereby the plates 1 and 2 rotatetherewith. Each plate has a beveled peripheral face l, which facesincline toward one another at their inner sides. Freely rotatable on theshaft 3 and surrounding the same is a spider frame 5 which consists ofspaced inner and outer concentric members 6 and 7 connected by radialspokes 8. The pulley periphery or tread is composed of a plurality ofsegments 9 each having its side faces formed with beveled portions 10 toconformably engage the beveled portions 1 of the plates 1 and 2. Eachsegment has an inwardly extending enlarged part 11 that terminates in areduced shank 12, each part 11 sliding through an aperture providedtherefor in the member (3 of the spider, and the shank 12 slides througha perfm'ation 13 formed in the member 7 of the spider and has a nut 18'for limiting its outward movement. A coil spring lei surrounds eachshank 12 and at one end abuts part 11 and its other end seats on theperiphery of the member 7 of the spider.

In operation it will be understood that under normal conditions thesegments are forced outwardly. by their respective springs so as to beheld free of contact with the beveled peripheries of the side plates 1and 2. When the operator grasps the knob D and pulls down on the belt,the weight of the stamp and belt causes four of the segments or half ofthe circumference of the wheel to be depressed against the actions ofthe springs, causing the beveled faces 10 of the four segments tofrictionally engage the beveled faces 4: of the plates 1 and 2, and asthe plates 1 and 2 are keyed to shaft 3 and rotate therewith, it will beseen that the segments will be 'aused to rotate with the shaft therebycausing the belt which engages the segments to move, effecting liftingof the weight. \Vhen the operator releases the belt and permits theweight to drop to operative position, the segments will be lifted by thespring, and the side plates will revolve independent of the segments,and since the latter remain quiescent there will he obviously no wear orburning of the rope or belt.

Having thus described my invention, I claim as no Y and desire to secureby Letters Patent t- 1. A pulley including in combination with acontinuously driven shaft, a pair of spaced plates secured to the shaftso as to rotate therewith, each of said plates having a beveledperipheral portion, a spider on the shaft and composed of inner andouter spaced concentric members secured to one another and placed on theshaft so as to 1'0- tate independent thereof, a series of segmentshaving beveled portions to engage with the beveled portions of theplates to cause movement of the segments with the pulley when soengaged, each segment having an outwardly projecting enlarged part and areduced shank at the inner end of said part, said parts and shanks beingreceived in openings provided therefor in said spider members, and acoil spring surrounding each shank and having one end engaged with thesaid enlarged part thereof, and having its opposite end engaged with theinner of said spider members to normally force the segment outwardly.

2. In a pulley, a pair of spaced side plates, a shaft rigidly connectedto said plates, a spider freely mounted on the shaft, a series of springpressed segments of greater width than that of the belt for positive anddirect engagement at their ends with the plate peripheries, and meansbetween the ends of the segments for slidably connecting the segments tothe spider.

In testimony whereof I have signed my 15 name to this specification inthe presence of two subscribing witnesses.

VILLIAM H. POND.

Vitnesses ADA E. HAGERTY, J. A. MILLER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. G.

